Reversible analog to digital converter



July 16, 1963 P. A. HOFFMAN 3,098,224

REVERSIBLE ANALOG T0 DIGITAL CONVERTER Filed April 2B. 1960 57 Sheets-Sheet 1 /0 22 50 55 f8 /6 q fe-Mom 4Z 52 (Ml ==f yi 15 Egg, 2 62 o g 66\L 58 28 64 6o 2@ z6\ 1 62 Egg.; T Egg. la 62 68 36 4-0 al 70 J2 l 34 64 u 60 \:1 @En t V :L 62 17% 4 T l1) g 'G E 1; 73 IN1/wmv e, PhliyAHoffman,

ATTGRNEYS July 16, 1963 P. A. Hor-PMAM REVERSIBLE ANALOG T0 DIGITAL CONVERTER Filed April 28. 1960 57 Sheets-Sheet 2 2ND DIG/T mak QQ;

2 ND DIGI T 57 Sheets-Sheet 4 Filed April 28. 1960 @kfw al kmq July 16, 1963 Fned April 2a. 1960 P. A. HOFFMAN REVERSIBLE ANALOG TO DIGITAL CONVERTER 5'7 Sheets-Sheet 5 July I6, 1963 P. A. HOFFMAN 3,098,224

REvERsIBLE ANALOG 'rp DIGITAL CONVERTER Filed April 28. 1960 57 Sheets-Sheet 8 l I (F/G- l5) 1A if@ zAtzBaJA 15B |4A4| i i i i 1380 .sw/Tarifs Tl 5 J:5&2 .et-56T FL/PHQP l i l A' y l l l .fw/rc l g4 I I l I 5w/rcH :L 5 l |396 GA TEPULSE f I l 1 v swlmv l i I i DZ swrrcn i I I 556 .rw/nw sw/ rnv H f 372 l i I .swf 7TH l I t l |374 c I conmmsan 1 i i 1 VONAGE e., 1 l I I l July 16, 1963 P, A. HOFFMAN 3,098,224

REVERSIBLE ANALoG 'ro DIGITAL coNvERmR Filed April 28. 1960 57 Sheets-Sheet 9 494 M- 6 46a we 5 564 512 e2 l el l 502 z 77% 1Q@ 24 fig 25 554 wPz/r aun-wr v) ,NPN PULSE TRAIN 592 da I 5.98 i* 596 TIME 602 Q our/ar aus TRA/N *4 590 -f T W/ TIME 26.2 Fig 2611 July 16, 1963 P. A. HOFFMAN REvERsIBLE ANALOG To DIGITAL coNvaR'rEn med p1-11 2e. leso 57 Sheets-Sheet 10 ASM s Il 1l W .,Wm WK July 16, 1963 P. A. HOFFMAN Rsvmsxm-z ANALOG Iro msnm. convmm med April ze, leso 57 Shasta-Sheet 11 Le if .m .3, e z Q P 02 5 W 2 n 4 n PIII/w 6 P Ul /U F F 6 Nw. 9 ,7, v Y M M, e M l f wn m f N M C l. ma r m 6 w 5 .z .2, n mm 6 3 5 f 7 5 GWV 5 o? n0 vll' 9 m. 6 a uw] D D NR N N N l G WE A A A 7 HN L L e 2 Rr OUTPUT TIME July 16, 1963 P. A. HOFFMAN Rsvmsrns ANALOG To DIGITAL convsa'rsn Filed April 28. `1960 57 Sheets-Sheet 12 /GTAL 5/6M AIVD .SIGNAL DIG/ PULSES Egg. 28a

DIGI TAL D/G/ 7 Pl/L 555 DIG/TAL INPI! T SIGN. A

SIG/l. ANO /G-l T PUL $6 P05 l TIO/YS MIK NQ .SY/VCH.

PULSE July 16,

HOFFMAN Filed April 2B. 1960 57 Sheets-Sheet 13 July 16, 1963 P. A. HOFFMAN 3,098,224

REVERSIBLE ANALOG TO DIGITAL CONVERTER Filed April 28. 1960 57 Sheets-Sheet 14 FF, D MTH/T 2L YUM-:B o16/r 1 /fvPl/r i Lx i 4,3

` Process/N6 I- vf rwoe/r l F l l commen A 8 FFR-vl WF1' 662 gw/T0?? 6 L fl 1 f j l" cawrfog 4 5 C P E F 658 MZK Fz/Pfwp 406 4 0 E f 2 [Pepa/QA Muse i 426 Fn Ffz 35s 566 566 A .'1- g@ 54 626 55a 42260 554 Amman/c ;L .L e. /voaf @in 7A PULSE Process/NG /N PW' NE rwoR/r I" www RA role V 4,0 5 Wl TCH C July 16, 1963 P. A. HOFFMAN RsvERsIBLE ANALOG 'ro DIGITAL convsmza mea p1-11 28. 1960 57 Sheets-Sheet 15 1 I CIZ/1128 l JAI/aff lzciJA .SW1 TCHES RESET FL/PFLP T0 f 5W! 7CH (FF7 5W! TENES (FP2) 5W! TCHES GA 7' E PULSE' SWITCHES SWITCHES PkAM/ER SWITCH .IIIIIIII P. A. Hon-'MAN 3,098,224

57 Sheets-Sheet 16 July 16, 1963 REVERSIBLE ANALOG T0 DIGITAL CONVERTER Filed April 28. 1960 SYNC.

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l* l O O O O O STE/PING- MECHA /V/SM /47Z CLOCK E 6A rE o/v Iggy@ SVNCH *gj O0OA` o o o o I ii I J July 16, 1963 P. A. HOFFMAN REVERSIBLE ANALOG T0 DIGITAL CONVERTER 57 Sheets-Sheet 19 Filed April 28, 1960 July 16, 1963 P. A. HOFFMAN REvEasxsLs ANALOG To DIGITAL comm-ras Filed April 28. 1960 57 Sheets-Sheet 20 mw .www 

1. A SIGNAL GENERATOR FOR ANALOG TO DIGITAL AND DIGITAL TO ANALOG CONVERTERS COMPRISING FIRST AND SECOND SIGNAL STORAGE MEANS, MEANS FOR STORING A REFERENCE SIGNAL ON SAID FIRST STORAGE MEANS, MEANS FOR PERIODICALLY COUPLING SAID FIRST AND SECOND STORAGE MEANS TOGETHER IN SIGNAL SHARING RELATIONSHIP WHEREBY SUCCESSIVE PORTIONS OF SAID REFERENCE SIGNAL ARE PERIODICALLY TRANSFERRED BETWEEN SAID FIRST STORAGE MEANS AND SAID SECOND STORAGE MEANS IN SUCCESSIVELY WEIGHTED QUANTITIES REPRESENTATIVE OF THE SUCCESSIVE DIGITS OF A NUMBER SYSTEM STARTING WITH THE MOST SIGNIFICANT DIGIT FIRST, MEANS FOR CHANGING THE SIGNAL ON ONE OF SAID STORAGE MEANS AFTER EACH SAID PERIODIC COUPLING BY AN AMOUNT EQUAL TO THE LAST TRANSFERRED PORTION OF SAID REFERENCE SIGNAL, AND ACCUMULATING MEANS COUPLED TO ONE OF SAID STORAGE MEANS FOR ACCUMULATING AN OUTPUT SIGNAL FROM SAID ONE STORAGE MEANS DIRECTLY PROPORTIONAL TO THE ALGEBRAIC SUM OF EACH OF SAID TRANSFERRED PORTIONS OF SAID REFERENCE SIGNAL. 